The stadium is mainly used for sports competitions and gatherings, and its sound system requirements mainly include: entrance ceremony, group gymnastics, on-site interpretation of football games, etc. At the same time, we should take into account the functional requirements of various sports competitions in the future, as well as the artistic performance, which plays a very important role in the weak current system of the football field. The stadium is characterized by an open space, large venue, large audience, large environmental interference and loud noise from the audience. The sound reinforcement system is required to have sufficient sound pressure level in the audience, sufficient dynamic range of sound: high language clarity: clear, bright and natural sound; Good sound transmission gain: ensure sufficient gain for microphone use; Uniformly distributed sound field: the sound at all positions of the football field covers evenly; Consistent transmission frequency characteristics: sound characteristics at all locations of the site are consistent. In order to let the audience hear the information sent by the referee during the match, the system is required to have a good sound transmission gain. The general sports factory is saddle-shaped, the surrounding audience is high, and the playing field is low. In this situation, the sound reinforcement of the audience is generally not suitable for centralized arrangement. It is often carried out by using the sound column hanging under the canopy or the medium and high frequency coaxial speakers for zonal sound reinforcement. The directional characteristics of the PA loudspeaker system are used to ensure that the audience has sufficient sound pressure level and good language clarity (in order to mask the impact of noise, the sound pressure is generally required to be about 100dB). For the seats under the platform, supplementary speakers can be used to eliminate dead corners. In order to save the power of the power amplifier, speakers with higher sensitivity are often selected. System expansion, input and output interfaces and multiple protection measures for radiating multiple audio signals in the site can output multi-channel audio signals to meet the connection of mobile sound reinforcement system, broadcast and television relay output, large screen system, call detection system, news release area and background broadcast system. System protection, in order to prevent the safety and reliability of the system equipment during use, can protect the equipment from damage, especially in case of accidents. Main equipment includes: system signal limiting setting, microphone feedback suppression, special audio isolation transformer and power purification system
